libjava/classpath/native/fdlibm/w_acos.c

   1
   2 /* @(#)w_acos.c 1.3 95/01/18 */
   3 /*
   4  * ====================================================
   5  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   6  *
   7  * Developed at SunSoft, a Sun Microsystems, Inc. business.
   8  * Permission to use, copy, modify, and distribute this
   9  * software is freely granted, provided that this notice
  10  * is preserved.
  11  * ====================================================
  12  */
  13
  14 /*
  15  * wrap_acos(x)
  16  */
  17
  18 #include "fdlibm.h"
  19
  20
  21 #ifdef __STDC__
  22         double acos(double x)           /* wrapper acos */
  23 #else
  24         double acos(x)                  /* wrapper acos */
  25         double x;
  26 #endif
  27 {
  28 #ifdef _IEEE_LIBM
  29         return __ieee754_acos(x);
  30 #else
  31         double z;
  32         z = __ieee754_acos(x);
  33         if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
  34         if(fabs(x)>1.0) {
  35                 return __kernel_standard(x,x,1); /* acos(|x|>1) */
  36         } else
  37             return z;
  38 #endif
  39 }